长方柱类

#include <iostream>    using namespace std;    class Box    {    public:        void get_value();       void get_display();    private:        void get_volume();          void get_surface();        float width;        float height;        float volume;      float surface;  };      void Box::get_value()    {         cout<<"请输入长,宽,高:";        cin>>lengh;       cin>>width;        cin>>height;        get_volume();          get_surface();    }      void Box::get_volume()    {        volume=lengh*width*height;    }      void Box::get_surface()    {        surface=2*(lengh*width+lengh*height+width*height);    }      void Box::get_display()    {               cout<<"The volume is: "<<volume<<endl;        cout<<"The surface  is: "<<surface<<endl;    }      int main()    {        Box b1,b2,b3;              b1.get_value();        cout<<"For box1: "<<endl;        b1.get_display();            b2.get_value();        cout<<"For box2: "<<endl;        b2.get_display();              b3.get_value();        cout<<"For box3: "<<endl;        b3.get_display();        return 0;    }